Fast transient fluorescence technique for monitoring gelation in free-radical crosslinking copolymerization


Pekcan O., Kaya D., Erdogan M.

POLYMER, vol.42, no.2, pp.645-650, 2001 (Peer-Reviewed Journal) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 42 Issue: 2
  • Publication Date: 2001
  • Doi Number: 10.1016/s0032-3861(00)00361-x
  • Journal Name: POLYMER
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.645-650
  • Keywords: fast transient fluorescence, sol-gel phase transition, lifetimes, CROSS-LINKING COPOLYMERIZATION, METHYL-METHACRYLATE, NETWORK FORMATION, ENERGY-TRANSFER, POLYMERIZATION, TRANSITION, MODEL

Abstract

The fast transient fluorescence technique was used to study the sol-gel phase transition in free-radical crosslinking copolymerization of methyl methacrylate (MMA) and ethylene glycol dimethacrylate. Pyrene (Py) was used as a fluorescence probe for the in situ polymerization experiments. Fluorescence lifetimes of Py from its decay traces were measured and used to monitor the gelation process. Stern-Volmer kinetics was employed to determine the quenching rate constant before the onset of gelation. The MMA consumption rate was measured during the gelation process using the Stern-Volmer model. (C) 2000 Elsevier Science Ltd. Ail rights reserved.